import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
  class TreeNode{
      char val;
      TreeNode left;
      TreeNode right;

    public TreeNode(char val) {
        this.val = val;
    }
}
public class Main {
      static int i=0;
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String str=in.nextLine();
            TreeNode root= createTree(str);
            inOrder(root);
        }

    }
    public static TreeNode createTree(String str) {
//        for (int i=0;i<str.length();i++) {
//            char ch = str.charAt(i);
            TreeNode root=null;

            if(str.charAt(i)!='#'){
                root=new TreeNode(str.charAt(i));
                i++;
                root.left=createTree(str);
                root.right=createTree(str);
            }else {
                i++;
            }

            return root;


    }
    public static void inOrder(TreeNode root){
        if(root==null){
            return ;
        }
        inOrder(root.left);
        System.out.print(root.val+" ");
        inOrder(root.right);

    }
}